CN111077762A - Beidou multimode time service receiving device - Google Patents
Beidou multimode time service receiving device Download PDFInfo
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- CN111077762A CN111077762A CN201811227299.9A CN201811227299A CN111077762A CN 111077762 A CN111077762 A CN 111077762A CN 201811227299 A CN201811227299 A CN 201811227299A CN 111077762 A CN111077762 A CN 111077762A
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- 239000000919 ceramic Substances 0.000 claims abstract description 66
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 9
- 230000005669 field effect Effects 0.000 claims abstract description 7
- 230000002265 prevention Effects 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 21
- 230000010287 polarization Effects 0.000 claims description 11
- 238000010897 surface acoustic wave method Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 5
- 239000010953 base metal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 2
- 230000036039 immunity Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000001629 suppression Effects 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 claims description 2
- 238000010295 mobile communication Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/14—Receivers specially adapted for specific applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
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Abstract
The Beidou multimode time service receiving device comprises a multimode broadband time service antenna and a multimode baseband demodulation module, wherein the multimode broadband time service antenna comprises a broadband ceramic medium circularly polarized antenna or a multimode antenna combination device, a front band-pass filter, a low noise field effect amplifier, a broadband band-pass filter, a single-chip low noise amplifier, a lightning surge voltage impact prevention circuit, a power supply voltage stabilizing circuit and a hemispherical omnidirectional fixing device. In order to adapt to the change of a Beidou navigation satellite playing system, a novel multimode antenna combination mode is adopted, meanwhile, the satellite addressing fixing structure is specially configured and a multimode baseband demodulation module is matched for use according to the frequency bands of B1I and B1C in the inclined static orbit, the current time service base station can be ensured to simultaneously receive different satellite navigation time service signals, the dependence on a GPS single satellite navigation system is strived to get rid of, and the safety, reliability and autonomy of mobile communication and power network time service in China are improved. The invention belongs to the field of satellite navigation time service.
Description
Technical Field
The invention relates to a Beidou multimode time service receiving device, which is particularly suitable for time service synchronization of a mobile communication station and a power network and is applied to a new generation of mobile communication and positioning navigation device. Belonging to the satellite positioning navigation time service field.
Background
The establishment of compatible satellite navigation and time service receiving devices has become common in the GNSS world. With the establishment of the Beidou third satellite navigation system, enterprises which specialize in satellite navigation semiconductor device manufacturing in China successively develop a radio frequency baseband integrated demodulation chip which mainly adopts the Beidou third satellite navigation system and is compatible with other GNSS navigation systems, and a foundation is laid for developing various satellite navigation application products in China. However, not only needs to make a breakthrough of a multimode radio frequency baseband integrated demodulation chip, but also needs to solve the coupling connection between a multimode satellite receiving antenna and a baseband chip, and before that, compatible time service navigation test equipment developed by Trimble (celestial treasure) corporation and NovAtel corporation in sweden mainly adopts independent GPS and GLONASS single-frequency antennas for combination, or a large-scale multimode metal antenna integrated with the radio frequency amplifier is designed. After the Beidou No. two preferentially occupies 1561.098MHz civil frequency points in China, the inventor firstly proposes and develops a miniature planar broadband ceramic medium antenna based on a bimodal broadband radio frequency receiving principle, realizes dual-mode receiving of the Beidou No. two B1 frequency points 1561.098 and 1575.42MHz civil frequency points shared by GPS and GALILEO, successfully tests in a mobile base station, writes the technology into patent document 200810080082.X, brings the GLONASS civil frequency points into the mobile base station in 200910073942.1 patent, and strives to realize multi-mode receiving of civil open signals of a GNSS navigation system. However, in view of a control file about a Beidou third interface, which is released by a China satellite navigation system management office in 11 months in 2017, a Beidou navigation satellite system is greatly adjusted, a B1C signal newly set in Beidou third is broadcasted on a medium-circle earth orbit (MEO) satellite and an inclined geosynchronous orbit (IGSO) satellite, the carrier frequency of the Beidou third is shared with 1575.42MHz of the American GPS, the bandwidth of the carrier frequency is definitely 32.736MHz, and the carrier frequency is modulated by adopting a BOC (1.1) binary offset carrier technology. As in table 1.
TABLE 1B 1C Signal Structure
Meanwhile, the B1I frequency point is still 1561.098MHz, but is definitely not played in a medium-circle earth orbit (MEO) satellite, which is a great change, so that the ground navigation time service equipment developed for the frequency point in China is required to be adaptively improved on products, and newly published national standard request notes also make new regulations on compatible modes of a measurement type receiver and put forward higher requirements on a measurement type receiving antenna. As shown in tables 2 and 3 and the figures.
TABLE 2 GNSS measurement receiver channel number and tracking capability
| Receiver class | Number of frequency points | Minimum system components | Number of channels |
| Single mode single frequency | ≥1 | BDS | ≥12 |
| Multimode single frequency | ≥2 | BDS+(GPS/GLONASS/Galileo) | ≥24 |
| Single mode multiple frequency | ≥2 | BDS | ≥24 |
| Multi-mode multi-frequency | ≥4 | BDS+(GPS/GLONASS/Galileo) | ≥48 |
| Full constellation multifrequency | ≥8 | BDS+GPS+GLONASS+Galileo | ≥96 |
TABLE 3 GNSS navigation system frequency point signal center frequency, code rate, bandwidth and modulation mode
Although the broadband time service active antenna technology adopted by the inventor patent 200910073942.1 is designed for being compatible with the L1 frequency point of the Beidou No. two B1 and the GPS, the receiving frequency band is wide, so that the requirement of receiving new carriers broadcast by the Beidou No. three B1I and B1C in a stationary orbit can be still met, most GNSS satellite navigation signals are required to be received in a high-quality compatible mode, adjustment must be carried out according to a Beidou new system, particularly, the frequency spectrum of the B1C is formed in a shifted carrier mode, and whether upper and lower sideband signals can be completely received becomes a key for guaranteeing demodulation accuracy, so that the existing multimode time service active antenna needs to be improved and improved. Especially, the B1I signal broadcast by the Beidou No. three is broadcast on the satellite in the stationary orbit, the ground receiving antenna is objectively required to have the hemispherical omnidirectional addressing function, and the related fixed structure is also correspondingly changed.
Disclosure of Invention
The invention aims to solve the problem that a time service receiving device which mainly comprises a multi-mode multi-system compatible time service active antenna and a multi-mode baseband demodulation and mainly comprises a Beidou I and a Beidou II is designed in a coordinated mode, so that the existing time service base station can simultaneously receive different satellite navigation time service signals, the dependence on a GPS single satellite navigation system is overcome, and the safety, reliability and autonomy of mobile communication and power network systems in China are improved.
The Beidou multimode time service receiving device consists of a multimode broadband time service active antenna and a multimode baseband demodulation module, and is characterized in that: the multimode broadband time service active antenna comprises a broadband ceramic dielectric circularly polarized antenna or a multimode antenna combination device, a front band-pass filter, a low-noise field effect amplifier, a broadband band-pass filter, a single-chip low-noise amplifier, a lightning surge voltage impact prevention circuit, a power supply voltage stabilizing circuit, a printed circuit board with a microstrip circuit, a non-standard N-type pin type connecting rod electric connector, an antenna shell and a unidirectional or hemispherical omnidirectional fixing device; the broadband ceramic medium circularly polarized antenna or the multimode antenna combination device can simultaneously receive Beidou No. three and GPS, Galileo, QZSS, IRNSS or GLONASS satellite navigation time service carrier signals, and the receiving frequencies are 1561.098MHz of the Beidou No. three B1I and 1575.42MHz of the frequency sharing of the Beidou No. three B1C, the GPS, the Galileo and the like; or 1602.56MHz for GLONASS; or can cover the military and civilian dual-purpose frequency bands such as the Beidou No. III B2\ B3, the GPS L2\ L5, the Galileo E5A \ E5B and E6, the GLONASS G2\ G3 and the like; the broadband ceramic dielectric circular polarization antenna or the multimode antenna combination device is arranged on one surface of the printed circuit board and is connected to the input end of the front band-pass filter on the other surface through a lead; or a single-mode single-frequency broadband ceramic dielectric antenna is specially arranged for receiving carrier signals broadcast by the B1C or B3I in the medium-circle orbit satellite;
the broadband band-pass filter adopts ceramic medium or surface acoustic wave filter, and the frequency response bandwidth selectable according to the compatible mode is 1166-1217MHz respectively; or 1250 + 1286 MHz; or 1550-; when a single-mode single frequency is adopted to receive the B1C carrier signal, the frequency response bandwidth of the ceramic medium or the surface acoustic wave filter is preferably selected from 1558-1592MHz, so that the upper and lower sideband signals modulated by the BOC technology are ensured to be completely received, and meanwhile, the frequency sharing signals such as GPS and Galileo are compatible;
the main technical parameters of the multimode broadband time service active antenna are as follows:
(1) frequency range [ MHz ]: 1166 and 1217 MHz; or 1250 + 1286 MHz; or 1550 + 1595 MHz; or to 1620 MHz; or 1558 and 1592MHz
(2) Gain [ dBi ]: > 20
(3) Noise coefficient [ dB ]: less than 2.5@ +25 deg.C and less than 3.0@ +80 deg.C
(4) Out-of-band rejection [ dB ]: fo 1190 MHz; or fo 1268 MHz;
or fo 1570 MHz; or fo 1575 MHz; or fo 1585MHz
fo±30MHz ＞5
fo±50MHz＞20
fo±100MHz ＞50
(5) Input-output voltage standing wave ratio: less than or equal to 2.0
(6) The anti-surge (impact) immunity performance conforms to
IEC 61000-4-5: 1995 standard; GB/T17626.5-2008 standard
And (3) surge wave shape: CWG combined wave, 1.2/50 μ s, 8/20 μ s
Voltage peak value [ V ]: not less than 2000
Number of pulses: 10
(7) The signal delay is less than 5 ns;
the broadband ceramic dielectric circular polarization antenna is a single-arm, two-arm or four-arm spiral ceramic dielectric circular polarization antenna, and is designed and manufactured by selecting a planar structure or a cylindrical spiral structure; or the planar broadband ceramic circular polarization antenna and the single-frequency spiral ceramic circular polarization antenna with the GLONASS center frequency of 1602.56MHz can be simultaneously selected to be combined; receiving 1575.42MHz frequency shared by Beidou III B1I and B1C and GPS and Galileo, or B1C and B3I single-mode single-frequency antennas, and preferably selecting a planar broadband ceramic structure; the full-frequency multimode receiving antenna is preferably a spiral broadband ceramic structure or a multilayer superposed plane and spiral ceramic dielectric circularly polarized antenna;
the preposed band-pass filter, the low-noise field effect amplifier, the broadband band-pass filter, the single-chip low-noise amplifier, the lightning-protection surge voltage impact circuit and the power supply voltage stabilizing circuit are positioned on the other surface of the printed circuit board; the circuit is arranged in the metal shielding cavity; the lightning protection surge voltage surge circuit is not suitable for selecting a gas lightning protection element, only can select a unidirectional TVS tube with excellent switching characteristic and voltage withstanding characteristic, is also called a transient voltage suppression diode, and can be connected to the ground in reverse direction before the power supply voltage stabilizing circuit to bear the lightning protection and static protection tasks, so that two or one lightning protection surge voltage surge circuit can be set for improving the safety factor; the reason is that the gas discharge element is unloaded by adopting a glow discharge principle, but random instantaneous high-voltage sharp pulses are inevitably generated at two ends of a discharge device during unloading, and the pulses can cause serious damage to a low-noise device;
the antenna shell is divided into a shell cover and a shell body, the printed circuit board is arranged in the shell body, the carrier output lead is connected with the non-standard N-type pin connecting rod electric connector, and the non-standard N-type pin connecting rod electric connector is fixed or embedded on the shell body; the bottom of the shell is of a plane fixing structure, and fixing nuts are embedded in the bottom fixing holes, so that the plane at the bottom of the antenna shell is conveniently fastened with the metal plane fixing device through screws; or a traditional fixing structure with a spiral groove at the bottom is adopted, and the bottom of the shell is fixed with an external plane metal fixing device through a fixing hole; the shell cover and the shell are hermetically sealed;
the unidirectional or hemispherical omnidirectional fixing device is designed for tracking a navigation satellite, requires the top of an antenna to be arranged towards the upper part of a zenith, and is suitable for receiving Beidou No. three medium-circular earth orbit (MEO) B1C signals and other shared satellite frequency band signals; the hemispherical omnidirectional fixing device requires that the antenna can horizontally turn at 180 degrees from left to right and also can tilt at 90 degrees forward, so that the time service active antenna can accurately face a Beidou navigation inclined geosynchronous orbit (IGSO) satellite or a geostationary geosynchronous orbit (GEO) satellite; selecting a maximum gain point to be received and fastening after the antenna is subjected to azimuth angle adjustment test;
the hemispherical omnidirectional fixing device is a necessary measure adopted for a novel Beidou No. three satellite playing system, and can be selected from various structures, such as an addressing fixing structure and the like which can imitate a satellite television antenna; according to the plane structure of the bottom of an antenna shell, a Beidou multimode time service active antenna is fixed on a plane base metal fixing plate through a fastening nut, the extension part of the metal plate is bent, a rotating shaft fixing hole and a guide hole capable of bending and sliding are arranged at the bent part so as to form 90-degree up-and-down inclined steering, correspondingly, a metal plate capable of being fixed with a holding pole is arranged, two rotating shaft fixing holes are correspondingly arranged at one end of the plate surface of the metal plate and the base metal fixing plate so as to be convenient for adjusting the azimuth angle and then integrally fixed, the other end of the metal fixing plate is of a bilaterally symmetrical holding pole structure and is fastened on the holding pole through four screws;
the multi-mode antenna combination device selectively combines a broadband ceramic dielectric antenna or a single-frequency ceramic dielectric antenna including a plane or a spiral antenna according to the use environment, and is fixed on a copper-clad printed circuit board by adopting a method of up-down superposition or plane separation so as to ensure that the high-quality navigation time service signal broadcasted by a navigation satellite is received; or a single-mode single-frequency or single-mode multi-frequency broadband ceramic dielectric antenna is arranged according to national specifications, for example, a single-frequency ceramic dielectric antenna is selected according to Beidou B2a and B3I radio frequency specifications, and a corresponding band-pass filter is selected according to carrier bandwidth, so as to meet special requirements of users.
The multi-mode baseband demodulation module is commonly called an OEM demodulation board card and comprises a multi-mode ceramic dielectric power divider, a ceramic dielectric or surface acoustic wave filter and a baseband demodulation module, and the multi-mode baseband demodulation module is installed and attached on a printed circuit board; the method is characterized in that: the input end of the multimode ceramic dielectric power divider is connected with a high-frequency carrier signal from a Beidou multimode time service active antenna, the output end of the multimode ceramic dielectric power divider is respectively connected with a special ceramic dielectric or an acoustic surface wave filter belonging to three frequency points B1I, B1C or GLONASS, or frequency points B2a and B3I, the output end of the ceramic dielectric or the acoustic surface wave filter is respectively connected with the input end of a baseband demodulation module, time service main and standby signals are specified through software compiling, the output of the time service main and standby signals is 1PPS (pulse per second), the error is less than 50ns, and the time service main and standby signals are used for reference time service of a.
The invention has the advantages that the device fully considers the big change of the Beidou navigation system and the Beidou third satellite broadcasting signal, and receives the middle and low orbit satellite signals and the static orbit satellite signals. The device is particularly suitable for mobile base station time service and power network time service.
Drawings
FIG. 1 is a schematic diagram of the principle of a Beidou multimode time service active antenna of the invention
FIG. 2 is a schematic diagram of the overall structure of the Beidou multimode time service active antenna
FIG. 3 is a schematic view of a broadband ceramic antenna stack assembly according to the present invention
(1) Plane ceramic antenna superposition combination
(2) Plane and spiral ceramic antenna superposition combination
FIG. 4 is a schematic diagram of the split combination of planar and helical ceramic antennas of the present invention
FIG. 5 is a schematic view of an omnidirectional addressing fixing structure of a time service active antenna according to the present invention
FIG. 6 is a schematic diagram of the lightning protection circuit principle and TVS tube characteristics of the present invention
FIG. 7 is a block diagram of a multimode baseband RF receiver of the present invention
FIG. 8 is a prior art radio frequency point distribution diagram of a Beidou navigation satellite system
Wherein: 1 broadband ceramic medium circular polarization antenna or antenna combination device, 2 preposed band-pass filter, 3 low-noise field effect amplifier, 4 broadband band-pass filter, 5 single-chip low-noise amplifier, 6 lightning surge voltage impact prevention circuit, 7 power supply voltage stabilizing circuit, 8 double-sided printed copper-clad plate containing microstrip circuit, 9 nonstandard N-type pin connecting rod electric connector, 10 shielding cover, 11 antenna shell cover, 12 antenna shell, 13 hemisphere omnidirectional fixing device, 14 fastening nut, 15 coaxial cable, 16 plane broadband ceramic medium antenna, 17 single-frequency spiral ceramic medium antenna, 18 one-way TVS tube, 19 guide hole, 20 holding pole, 21 multimode ceramic medium power divider, 22 ceramic medium or surface acoustic wave filter, 23 baseband demodulation module
Detailed Description
The big Dipper multimode time service active antenna is constructed as shown in figure 1, a broadband ceramic dielectric antenna 1 receives a composite navigation signal and then is connected to the input end of a low noise amplifier 3 through a preposed band-pass filter 2, the output end of the low noise field effect amplifier 3 is connected with a broadband band-pass filter 4, then is connected with the input end of a nonstandard N-type pin type connecting rod electric connector 9 through a single chip low noise amplifier 5 by a coaxial cable 15, and the N-type end of the connecting rod 9 is connected with a baseband time service decoding system through the coaxial cable 15 to form a low noise high frequency RF amplification receiving link; the lightning surge voltage surge prevention circuit 6 and the power supply voltage stabilizing circuit 7 ensure power supply on one hand, and prevent harmful electric pulses from damaging low-noise devices through a power supply circuit on the other hand.
In order to cover civil frequency band signals broadcast by a Beidou satellite, the antenna combination device can select a planar broadband ceramic dielectric antenna 16 and a planar single-frequency ceramic dielectric antenna 17 to be combined in an up-and-down overlapping mode, or select the planar broadband ceramic dielectric antenna 16 and a single-frequency spiral ceramic dielectric antenna 17 to be combined in a split mode, or select the broadband spiral ceramic dielectric antenna 17 and the planar single-frequency ceramic dielectric antenna to be combined, and the lead of the combined antenna is connected with the input end of the preposed band-pass filter.
The invention relates to a hemispherical omnidirectional fixing device 13 which is a necessary means adopted for a new playing system suitable for a Beidou third satellite, wherein the hemispherical omnidirectional fixing device 13 can be selected from various structures, such as an addressable fixing structure of a satellite television antenna and the like, the hemispherical omnidirectional fixing device 13 is fixed on a plane metal fixing plate through a fastening nut 14 according to the plane structure of the bottom of an antenna shell, the extension part of the metal plate is bent, a rotating shaft fixing hole and a guide hole 19 which can slide in a bending way are arranged at the bent part so as to form a vertical inclined steering of 90 degrees, correspondingly, the metal plate needs to be fixed with a holding pole 20, two rotating shaft fixing holes are correspondingly arranged on one side of the plate surface of the metal plate so as to integrally fix a time service antenna after addressing, and the other side of the metal holding pole is of a double-side metal holding.
The multimode baseband demodulation module is commonly called as an OEM demodulation board card and is provided with a multimode ceramic medium power divider 21, the input end of the multimode baseband demodulation module is connected with a high-frequency carrier signal from a Beidou multimode time service active antenna, the output end of the multimode baseband demodulation module is respectively connected with ceramic media or surface acoustic wave filters 22 special for three frequency points of B1I and B1C, GLONASS, frequency points of B2a and B3I, then the multimode baseband demodulation module is respectively connected with the input end of the baseband demodulation module 23, time service main and standby signals are specified through software compiling, the output of the signals is 1PPS second pulse, and the error is less than 50ns and the signals are used for time service of a mobile base station.
Claims (2)
1. Big dipper multimode time service receiving arrangement comprises multimode broadband time service active antenna, multimode baseband demodulation module, its characterized in that: the multimode broadband time service active antenna comprises a broadband ceramic dielectric circularly polarized antenna or a multimode antenna combination device, a front band-pass filter, a low-noise field effect amplifier, a broadband band-pass filter, a single-chip low-noise amplifier, a lightning surge voltage impact prevention circuit, a power supply voltage stabilizing circuit, a printed circuit board with a microstrip circuit, a non-standard N-type pin type connecting rod electric connector, an antenna shell and a unidirectional or hemispherical omnidirectional fixing device; the broadband ceramic medium circularly polarized antenna or the multimode antenna combination device can simultaneously receive Beidou No. three and GPS, Galileo, QZSS, IRNSS or GLONASS satellite navigation time service carrier signals, and the receiving frequencies are 1561.098MHz of the Beidou No. three B1I and 1575.42MHz of the frequency sharing of the Beidou No. three B1C, the GPS, the Galileo and the like; or 1602.56MHz for GLONASS; or can cover the military and civilian dual-purpose frequency bands such as the Beidou No. III B2\ B3, the GPS L2\ L5, the Galileo E5A \ E5B and E6, the GLONASS G2\ G3 and the like; the broadband ceramic dielectric circular polarization antenna or the multimode antenna combination device is arranged on one surface of the printed circuit board and is connected to the input end of the front band-pass filter on the other surface through a lead; or a single-mode single-frequency broadband ceramic dielectric antenna is specially arranged for receiving carrier signals broadcast by the B1C or B3I in the medium-circle orbit satellite;
1) the broadband band-pass filter adopts ceramic medium or surface acoustic wave filter, and the frequency response bandwidth selectable according to the compatible mode is 1166-1217MHz respectively; or 1250 + 1286 MHz; or 1550-; when a single-mode single frequency is adopted to receive the B1C carrier signal, the frequency response bandwidth of the ceramic medium or the surface acoustic wave filter is preferably selected from 1558-1592MHz, so that the upper and lower sideband signals modulated by the BOC technology are ensured to be completely received, and meanwhile, the frequency sharing signals such as GPS and Galileo are compatible;
2) the main technical parameters of the multimode broadband time service active antenna are as follows:
(1) frequency range [ MHz ]: 1166 and 1217 MHz; or 1250 + 1286 MHz;
or 1550 + 1595 MHz; or to 1620 MHz; or 1558 and 1592MHz
(2) Gain [ dBi ]: > 20
(3) Noise coefficient [ dB ]: less than 2.5@ +25 deg.C and less than 3.0@ +80 deg.C
(4) Out-of-band rejection [ dB ]: fo 1190 MHz; or fo 1268 MHz;
or fo 1570 MHz; or fo 1575 MHz; or fo 1585MHz
fo±30MHz ＞5
fo±50MHz ＞20
fo±100MHz ＞50
(5) Input-output voltage standing wave ratio: less than or equal to 2.0
(6) The anti-surge (impact) immunity performance conforms to
IEC 61000-4-5: 1995 standard; GB/T17626.5-2008 standard
And (3) surge wave shape: CWG combined wave, 1.2/50 μ s, 8/20 μ s
Voltage peak value [ V ]: not less than 2000
Number of pulses: 10
(7) The signal delay is less than 5 ns;
3) the broadband ceramic dielectric circular polarization antenna is a single-arm, two-arm or four-arm spiral ceramic dielectric circular polarization antenna, and is designed and manufactured by selecting a planar structure or a cylindrical spiral structure; or the planar broadband ceramic circular polarization antenna and the single-frequency spiral ceramic circular polarization antenna with the GLONASS center frequency of 1602.56MHz can be simultaneously selected to be combined; receiving 1575.42MHz frequency shared by Beidou III B1I and B1C and GPS and Galileo, or B1C and B3I single-mode single-frequency antennas, and preferably selecting a planar broadband ceramic structure; the full-frequency multimode receiving antenna is preferably a spiral broadband ceramic structure or a multilayer superposed plane and spiral ceramic dielectric circularly polarized antenna;
4) the preposed band-pass filter, the low-noise field effect amplifier, the broadband band-pass filter, the single-chip low-noise amplifier, the lightning-protection surge voltage impact circuit and the power supply voltage stabilizing circuit are positioned on the other surface of the printed circuit board; the circuit is arranged in the metal shielding cavity; the lightning protection surge voltage surge circuit is not suitable for selecting a gas lightning protection element, only can select a unidirectional TVS tube with excellent switching characteristic and voltage withstanding characteristic, is also called a transient voltage suppression diode, and can be connected to the ground in reverse direction before the power supply voltage stabilizing circuit to bear the lightning protection and static protection tasks, so that two or one lightning protection surge voltage surge circuit can be set for improving the safety factor;
5) the antenna shell is divided into a shell cover and a shell body, the printed circuit board is arranged in the shell body, the carrier output lead is connected with the non-standard N-type pin connecting rod electric connector, and the non-standard N-type pin connecting rod electric connector is fixed or embedded on the shell body; the bottom of the shell is of a plane fixing structure, and fixing nuts are embedded in the bottom fixing holes, so that the plane at the bottom of the antenna shell is conveniently fastened with the metal plane fixing device through screws; or a traditional fixing structure with a spiral groove at the bottom is adopted, and the bottom of the shell is fixed with an external plane metal fixing device through a fixing hole; the shell cover and the shell are hermetically sealed;
6) the unidirectional or hemispherical omnidirectional fixing device is designed for tracking a navigation satellite, requires the top of an antenna to be arranged towards the upper part of a zenith, and is suitable for receiving Beidou No. three medium-circular earth orbit (MEO) B1C signals and other shared satellite frequency band signals; the hemispherical omnidirectional fixing device requires that the antenna can horizontally turn at 180 degrees from left to right and also can tilt at 90 degrees forward, so that the time service active antenna can accurately face a Beidou navigation inclined geosynchronous orbit (IGSO) satellite or a geostationary geosynchronous orbit (GEO) satellite; selecting a maximum gain point to be received and fastening after the antenna is subjected to azimuth angle adjustment test;
7) the hemispherical omnidirectional fixing device is a necessary measure adopted for a novel Beidou No. three satellite playing system, and can be selected from various structures, such as an addressing fixing structure and the like which can imitate a satellite television antenna; according to the plane structure of the bottom of an antenna shell, a Beidou multimode time service active antenna is fixed on a plane base metal fixing plate through a fastening nut, the extension part of the metal plate is bent, a rotating shaft fixing hole and a guide hole capable of bending and sliding are arranged at the bent part so as to form 90-degree up-and-down inclined steering, correspondingly, a metal plate capable of being fixed with a holding pole is arranged, two rotating shaft fixing holes are correspondingly arranged at one end of the plate surface of the metal plate and the base metal fixing plate so as to be convenient for adjusting the azimuth angle and then integrally fixed, the other end of the metal fixing plate is of a bilaterally symmetrical holding pole structure and is fastened on the holding pole through four screws;
8) the multi-mode antenna combination device selectively combines a broadband ceramic dielectric antenna or a single-frequency ceramic dielectric antenna including a plane or a spiral structure antenna according to the using environment, and is fixed on a printed circuit board by adopting a method of up-down superposition or plane separation so as to ensure that the high-quality navigation time service signal broadcasted by a navigation satellite is received; or a single-mode single-frequency or single-mode multi-frequency broadband ceramic dielectric antenna is arranged according to national specifications, for example, a single-frequency ceramic dielectric antenna is selected according to Beidou B2a and B3I radio frequency specifications, and a corresponding band-pass filter is selected according to carrier bandwidth, so as to meet special requirements of users.
2. The multi-mode baseband demodulation module of the Beidou multi-mode time service receiving device of claim 1 is commonly called an OEM demodulation board card, comprises a multi-mode ceramic dielectric power divider, a ceramic dielectric or surface acoustic wave filter and a baseband demodulation module, and is installed and attached on a printed circuit board; the method is characterized in that: the input end of the multimode ceramic dielectric power divider is connected with a high-frequency carrier signal from a Beidou multimode time service active antenna, the output end of the multimode ceramic dielectric power divider is respectively connected with a special ceramic dielectric or an acoustic surface wave filter belonging to three frequency points B1I, B1C or GLONASS, or frequency points B2a and B3I, the output end of the ceramic dielectric or the acoustic surface wave filter is respectively connected with the input end of a baseband demodulation module, time service main and standby signals are specified through software compiling, the output of the time service main and standby signals is 1PPS (pulse per second), the error is less than 50ns, and the time service main and standby signals are used for reference time service of a.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811227299.9A CN111077762A (en) | 2018-10-22 | 2018-10-22 | Beidou multimode time service receiving device |
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| CN201811227299.9A CN111077762A (en) | 2018-10-22 | 2018-10-22 | Beidou multimode time service receiving device |
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| CN111077762A true CN111077762A (en) | 2020-04-28 |
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| CN201811227299.9A Pending CN111077762A (en) | 2018-10-22 | 2018-10-22 | Beidou multimode time service receiving device |
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